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Question & Answer

We are discussing Gardening, Growing and Green Thumbs!
With Brian Walters, Diana O'Brien and Pauline Cornish

Question:
I planted a Yellow Top Ash (Eucalyptus luehmanniana) five or six years ago on Sydney's northern beaches. Some of the leaves have a red/yellow/rust appearance which I think may be red spider mite. I haven't noticed it on the local bush mallees. I assume those leaves are permanently damaged. Can I prevent this happening. (Diana's response)

Answer:
Diana - First have the problem identified by taking some of the affected leaves to a local native plant nursery. This particular mallee (Eucalyptus luehmanniana) has a very small area of distribution in the coastal scrub around Sydney.

Rust is a fungal disease, whereas red spider mite is an insect that proliferates in dry conditions. If it is possible increased soil moisture levels as well as humidity should reduce the problem of mites. Spraying with either a miticide or fungicide is not recommended.

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